Preheat oven to 350°F. Grease an 8×4-inch loaf pan with nonstick cooking spray or butter.
In a large mixing bowl, whisk together the vegetable oil, applesauce, brown sugar, granulated sugar, eggs, and vanilla until combined.
¼ cup vegetable oil, ⅓ cup applesauce, ¾ cup packed light brown sugar, ¼ cup granulated sugar, 2 large eggs, 1 teaspoon vanilla extract
Add in grated zucchini and stir to combine.
2 cups shredded zucchini
In a separate small mixing bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.
1 ½ cups all-purpose flour, ½ teaspoon baking powder, ½ teaspoon baking soda, ½ teaspoon salt, 1 teaspoon cinnamon
Pour the flour mixture into the bowl of wet ingredients and gently stir together until just combined. Do not overmix.
Pour batter into prepared pan. Bake 50-60 minutes, or until a toothpick inserted into the center of the loaf comes out clean.
Allow to cool slightly before slicing and serving.